| All Patents in class 74/421R |
Patents 16 -
30
of 47
      |
| Number | Date | Patentee | Title | Type |
| 488,197 | Dec. 20, 1892 | H. Hackney | Belt-tightener | industrial machine pulleys and belt drive mechanisms |
| 503,012 | Aug. 08, 1893 | J.J. Stevens | Attachment for drilling-machines | drill presses |
| 504,657 | Sep. 05, 1893 | H. Binsse | Gearing for Lathes | metalworking variable speed mechanisms |
| 595,731 | Dec. 21, 1897 | M.B. Pengnet | Electric motor | electric motors |
| 606,549 | Jun. 28, 1898 | E. Holmes | Portable electric drill | handheld power tools |
| 619,859 | Feb. 21, 1899 | W. Buckley | Lathe | screwcutting lathes |
| 690,360 | Dec. 31, 1901 | A.E. Canedy | Driving-motor | blowers |
| 697,629 | Apr. 15, 1902 | H.B. Keiper | Combined gearing and casing therefor | forge blowers |
| 733,719 | Jul. 14, 1903 | W. Goers, F.A. Kehl | Multiple-drill attachment for drill presses | drilling and boring |
| 809,394 | Jan. 09, 1906 | A. Pedersen | Electrically-operated portable drill | handheld power tools |
| 848,025 | Mar. 26, 1907 | J.P. Golden | Gearing for Cane-Mills | sugar cane apparatus |
| 964,764 | Jul. 19, 1910 | A.L. De Leeuw | Spindle Locking Mechanism for Machine Tools | milling machines |
| 1,070,990 | Aug. 19, 1913 | W.L. Schellenbach | Spindle Nose Appliance for Machine Tools | metal lathe accessories and attachments |
| 1,108,107 | Aug. 18, 1914 | A.L. De Leeuw | Feed Mechanism for Machine Tools | metalworking variable speed mechanisms |
| 1,109,325 | Sep. 01, 1914 | W.O. Duntley | Electric drill | handheld power drills |
